If you think prices on surplus firearms have changed, and the "good old days" were cheaper, use an Inflation Calculator to figure out what those 1957, etc. prices would generally be in 2019. Those 1957 Hunters Lodge $89 Garands would cost $800 in 2019. BM-59s would sell for over $1200 in today's dollars. $40 Mausers? $360. So not much difference in many ways, esp. since most of those advertised prices were for the lower condition weapons. Better selections, perhaps. And of course direct shipping.
Money was tighter--Average annual salary in 1957 was about $5500.
Now, in 1992 I was buying M1891 Mosins from Century Arms for as little as $9.97 with free shipping! $18 in 2019 $$$. The golden days started in 1987-and continue.
https://www.usinflationcalculator.com/